According to the Global Asthma Report 2018, the prevalence of asthma globally is estimated to be around 339 million people. This number has been steadily increasing over the years, and it is predicted that by 2025, the number of people with asthma will reach 400 million. Asthma affects people of all ages, but it is more common in children. The prevalence of asthma varies across different countries and regions, with higher rates reported in developed countries compared to developing countries.